Posted by Anonymous on Wednesday, February 16, 2011 at 8:41pm.
sec^3 x tan x dx
| = integral symbol
Rewrite as
| sec^2 x sec x tan x dx
u = sec x
du = sec x tan x
| u^2 du
1/3 u^3 + C
Substitute back in, u = sec x
1/3 sec^3 x + C
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